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  Mirror flipped array platformer problems  (Read 626 times)
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Offline Pakz

Junior Newbie





« Posted 2011-10-09 18:46:03 »

I have this problem with setting up a array. I found a tile map example on this forum but it gives me errors. It seems that the array is flipped and mirrored. I want to set it up so that the rows and collums are the same as on the screen. Somehow the width turns out to be the height and the height seems to be the width.

How do you set up the map array so that the screen buildup is the same as the array?

Here is the code of what I am trying to do.

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import java.awt.*;
import java.applet.*;

public class GhostandGoblins01 extends Applet implements Runnable {
   // Graphics for double buffering.
  Graphics          bufferGraphics;
      Image             offscreen;
// This is the map array.
  private short map[][]= new short[][]{
   {1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1},
   {1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1},
   {1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1},
   {1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1},
   {1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1},
   {1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1},
   {1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1},
   {1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1},
   {1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1},
   {1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1},
   {1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1},
   {1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1},
   {1,1,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1},
   {1,1,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1},
   {1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1},
   };
   int               mapwidth =          20;
   int              mapheight =       15;
   int              cellwidth =       16;
   int              cellheight =       16;
   double             px =             200;
   double            py =            100;
   int               pwidth =          cellwidth/2;
   int               pheight =          cellheight;
   boolean            isjumping =       false;
   boolean          isfalling =       false;
   double            gravity =          0;
   boolean            ismovingright =      false;
   boolean            ismovingleft =       false;
   double            jumpforce =       3;

   public void init() {
         setBackground(Color.black);
          offscreen = createImage(getSize().width,getSize().height);
         bufferGraphics = offscreen.getGraphics();
      initmap();
      new Thread(this).start();

   }

   public void initmap(){
   }

   public void paint(Graphics g) {
   }

    public void run() {
        for(;;) { // animation loop never ends
        updateplayer();
           repaint();
           try {
               Thread.sleep(10);
               }
               catch (InterruptedException e) {
               }
       }
    }

    public void updateplayer(){

      if ( isjumping == false && isfalling == false ){
         if( mapcollision( (int)px , (int)py+1 , pwidth , pheight ) == false ){
            isfalling = true;
            gravity = 0;
         }
      }
      if (ismovingright){
         if ( mapcollision( (int)(px + 1) , (int)py , pwidth , pheight ) == false ){
            px += 1;
         }
      }
      if (ismovingleft){
         if ( mapcollision( (int)(px - 1) , (int)py , pwidth , pheight ) == false ){
            px -= 1;
         }
      }

      if ( isfalling == true && isjumping == false ){
         for ( int i = 0 ; i < gravity ; i++ ){
            if ( mapcollision ( (int)px , (int)(py + 1) , pwidth , pheight ) == false ){
               py += 1;
            }else{
               gravity = 0;
               isfalling = false;
            }
         }
         gravity += .1;
      }

      if ( isjumping == true && isfalling == false ){
         for ( int i = 0 ; i < gravity ; i++){
            if ( mapcollision ( (int)px , (int)(py - 1) , pwidth , pheight ) == false ){
               py -= 1;
               //System.out.print("still jumping : " + gravity);
           }else{
               gravity = 0;
               isfalling = true;
               isjumping = false;
            }
         }
         if( gravity < 1 ) {
            gravity = 0;
            isfalling = true;
            isjumping = false;
         }
         gravity -= .1;
      }



    }

    public boolean mapcollision( int x , int y , int width , int height ){
       int mapx = x / cellwidth;
       int mapy = y / cellheight;
       for ( int y1 = mapy - 1 ; y1 < mapy + 2 ; y1++ ){
          for ( int x1 = mapx - 1 ; x1 < mapx + 2 ; x1++ ){
             if ( x1 >= 0 && x1 < mapwidth && y1 >= 0 && y1 < mapheight ){
                if ( map[x1][y1] == 1 ){
                   Rectangle rec1 = new Rectangle( x , y , width , height );
                  Rectangle rec2 = new Rectangle( x1 * cellwidth,
                                          y1 * cellheight,
                                          cellwidth,
                                          cellheight);
                  if( rec1.intersects( rec2 )) return true;
                }
             }
          }
       }
      return false;
    }

     public boolean mouseMove(Event e, int x, int y){
      return true;
   }

    public void update(Graphics g){
       bufferGraphics.clearRect(0,0,getSize().width,getSize().width);
        bufferGraphics.setColor(Color.red);
        bufferGraphics.drawString("Platformer Springies Example.",10,10);

        // Draw map
       // If you use the y < mapheight and x < mapwidth then it gives a array out of bounds error
       for( int y = 0 ; y < 16 ; y++ ){
           for ( int x = 0 ; x < 15 ; x++){
              if( map[x][y] == 1 ){
                 bufferGraphics.fillRect( x * cellwidth , y * cellheight , cellwidth , cellheight );
              }
           }
        }

        // Draw player
       bufferGraphics.fillRect( (int)px , (int)py , pwidth , pheight );

         g.drawImage(offscreen,0,0,this);
    }

    public boolean keyDown (Event e, int key){
        if( key == Event.LEFT )
        {
           ismovingleft = true;
        }
        if(key==Event.RIGHT)
        {
            ismovingright = true;
        }

        if( key == 32 ) // space bar for jump
       {
            if( isfalling == false && isjumping == false )
            {
                isjumping = true;
                gravity = jumpforce;
            }
        }

        System.out.println (" Integer Value: " + key);

       return true;
    }

   public boolean keyUp (Event e, int key){
        if( key == Event.LEFT )
        {
            ismovingleft = false;
        }
        if( key == Event.RIGHT )
        {
            ismovingright = false;
        }

      return true;
   }

}
Offline theagentd
« Reply #1 - Posted 2011-10-09 21:56:08 »

Think about how your map array is defined. It's an array of short arrays.
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private short map[][]= new short[][]{
    {1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1},
    {1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1},
    {1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1},
    {1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1},
    {1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1},
    {1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1},
    {1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1},
    {1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1},
    {1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1},
    {1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1},
    {1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1},
    {1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1},
    {1,1,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1},
    {1,1,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1},
    {1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1},
};

If you write the line
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map[x][y]
where will you end up?
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short[] line = map[x];
short tile = line[y];
//The above code is the same as:
//short tile = map[x][y];

You have arrays of lines. The first array index refers to the line, as seen in your array definition. The second one refers to the column in this line. Line equals y-coordinate, and column equals x-coordinate. In other words, you need to use
1  
map[y][x]
instead of
1  
map[x][y]

Sorry for having so many code blocks, but
1  
[x]
is converted to a list element when posting... >_>

Myomyomyo.
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